# -*- coding:utf-8 -*-
import os
from PIL import Image

def splitimage(src, rownum, colnum, dstpath):
    img = Image.open(src)
    w, h = img.size
    if rownum <= h and colnum <= w:
        s = os.path.split(src)
        if dstpath == '':
            dstpath = s[0]
        fn = s[1].split('.')
        basename = fn[0]
        ext = fn[-1]

        num = 0
        rowheight = h // rownum
        colwidth = w // colnum
        for r in range(rownum):
            for c in range(colnum):
                box = (c * colwidth, r * rowheight, (c + 1) * colwidth, (r + 1) * rowheight)
                img.crop(box).save(os.path.join(dstpath, 'P' + basename + '_' + str(num) + '.' + ext))
                num = num + 1
    else:
        print('不合法的行列切割参数！')